Pima County Logo
  • Onsite Wastewater Treatment Facilities

    About 25% of the United States population lives in areas that use onsite wastewater treatment facilities (onsites), commonly known as septic systems. Surface water and groundwater contamination associated with onsites often stems from failures due to age or improper maintenance; however, even properly functioning facilities can cause environmental degradation and pose public health risks.

    Depending upon soil type, water saturation, and other factors, nutrients and microbial pollutants can migrate long distances down-gradient from properly functioning (but poorly designed) systems and ultimately reach surface water and groundwater. The Arizona Department of Environmental Quality has identified onsite wastewater treatment facilities as a contributing factor to water quality impairment in Arizona.

    There is a need to educate onsite owners and pumpers who maintain the facilities, as well as designers, installers, contractors, regulators, and health officials on the proper siting, design, installation, operation, and maintenance of onsite wastewater treatment facilities.

    PDEQ reviews and approves plans for ALTERNATIVE onsite wastewater treatment facilities and the Pima County  Development Services Department (DSD) reviews and approves plans for CONVENTIONAL onsite wastewater treatment facilities in order to ensure that they are designed and constructed in accordance with the Arizona State Aquifer Protection Permit (APP) Rules and the Pima County Code.
    Inspection of Alternative On-Site Wastewater Treatment Facility
    Facility approval results in a "Construction Authorization issued by PDEQ (Alternative Facilities) or DSD (Conventional Facilities).

    Conventional Facilities
    Alternative Facilities
    Transfer of Property Septic Inspection
    System Closure or Abandonment
    Liquid Waste Haulers
    Gray Water Use

    Follow UsShare this page

    Department of Environmental Quality

    33 N. Stone Ave., Suite 700
    Tucson, AZ 85701

    Phone: (520) 724-7400
    Fax: (520) 838-7432


    Department Home Page
    Department News
    Department Hours
    Department Directory
    Department Feedback Form
    Report a problem
    Department Calendar
    Boards, Commissions and Committees
    Rules and Regulations
    Reports and Publications
    Department Forms
    Permitting